0:00
Hello.
00:01
So radiation power is given by the emissivity time the conductivity, time the area, time the temperature to exponent 4.
00:14
These two are constants so we can say that the power proportional to a t espioning 4.
00:29
So let's start up for the first one.
00:33
It has an area of 2 .5 and temperature in just a second and push like that the temperature is negative uh temperature is negative and that has to be in kelvin so we add to 773 and that's going to be 200 k and so the equivalent power is going to be uh 2 .5 200 that's 1 and 4 that's going to be 4 times time hard as a second yeah, times 10 to the 4.
01:44
Let me take the question of that.
01:46
2 .5 times 200 that's point in 4.
01:52
Uh, this is mine, not 4, excuse me.
02:01
This is mine, okay? then we go to the second one, where the area is still 2 .5.
02:15
Oops, no, it's not 2 .5.
02:19
The area is 0 .8 .8.
02:23
That's a meter square, right? this is also meter square.
02:28
The temperature is 27 degrees celsius we convert an active kelvin and then you get 300.
02:41
The corresponding power is going to be 0 .8 times 300 that's 0 .4...